Debt - Long Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Long term Debt [Abstract]
Total outstanding principal	$ 6,997.3	$ 7,474.9
Total outstanding debt	6,951.5	7,415.1
Less: current portion	(124.3)	(47.2)
Long-term debt, net of current portion	6,827.2	7,367.9
Nexstar [Member] \| Secured Debt [Member] \| Term Loan A, due October 2023 [Member]
Long term Debt [Abstract]
Total outstanding principal		485.4
Unamortized financing costs and (discount) premium		(1.1)
Nexstar [Member] \| Secured Debt [Member] \| Term Loan A, due September 2024 [Member]
Long term Debt [Abstract]
Total outstanding principal		604.4
Unamortized financing costs and (discount) premium		(5.1)
Nexstar [Member] \| Secured Debt [Member] \| Term Loan A, due June 2027 [Member]
Long term Debt [Abstract]
Total outstanding principal	2,364.4
Unamortized financing costs and (discount) premium	(8.3)
Nexstar [Member] \| Secured Debt [Member] \| Term Loan B, due January 2024 [Member]
Long term Debt [Abstract]
Total outstanding principal		595.0
Unamortized financing costs and (discount) premium		(5.6)
Nexstar [Member] \| Secured Debt [Member] \| Term Loan B, due September 2026 [Member]
Long term Debt [Abstract]
Total outstanding principal	1,561.3	2,644.3
Unamortized financing costs and (discount) premium	(32.6)	(42.8)
Nexstar [Member] \| Senior Subordinated Notes [Member] \| 5.625% Notes, due July 2027 [Member]
Long term Debt [Abstract]
Total outstanding principal	1,713.8	1,785.0
Unamortized financing costs and (discount) premium	4.2	5.2
Nexstar [Member] \| Senior Subordinated Notes [Member] \| 4.75% Notes, due November 2028 [Member]
Long term Debt [Abstract]
Total outstanding principal	1,000.0	1,000.0
Unamortized financing costs and (discount) premium	(7.1)	(8.1)
Mission [Member]
Long term Debt [Abstract]
Less: current portion	(3.0)	(3.0)
Long-term debt, net of current portion	352.8	355.5
Mission [Member] \| Secured Debt [Member] \| Term Loan B, due June 2028 [Member]
Long term Debt [Abstract]
Total outstanding principal	296.3	299.3
Unamortized financing costs and (discount) premium	(2.0)	(2.3)
Mission [Member] \| Secured Debt [Member] \| Revolving loans, due June 2027 [Member]
Long term Debt [Abstract]
Total outstanding principal	$ 61.5
Mission [Member] \| Secured Debt [Member] \| Revolving loans, due October 2023 [Member]
Long term Debt [Abstract]
Total outstanding principal		$ 61.5

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation.

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